Balance Due Calculator
A bill for $1,200, a deposit of $500, a second installment of $300: what is still owed? Doing it in your head is easy until the numbers multiply across invoices, clients, or household bills. One missed payment in the mental math and you underpay a contractor or overpay a supplier.
The Balance Due Calculator below keeps the running total honest. Single payment mode subtracts one payment from the total and flags overpayments. Multiple payments mode handles installment payments: list every payment made and it shows exactly what remains.
Subtract what has been paid from what was owed. Overpayments are flagged automatically.
How to use the Balance Due Calculator
Single payment: enter the total amount and the amount paid, then calculate. Multiple payments: enter the total, then list each payment on its own line (leave unused lines blank). The calculator totals the payments and shows the remaining balance, or flags an overpayment.
Formula
Balance Due = Total Amount − Amount Paid
With several payments: Balance Due = Total Amount − (Payment 1 + Payment 2 + …). A negative result means the account was overpaid, and the calculator reports the overpaid amount.
Worked examples
Single payment. A contractor's invoice totals $1,200.00 and you have paid $500.00: $1,200.00 − $500.00 = $700.00 still due. If you had paid $1,300.00 by mistake, the result reads Overpaid: $100.00.
Installments. The same $1,200.00 invoice with three payments of $500.00, $300.00, and $250.00: total paid is $1,050.00, so the balance due is $150.00. Both examples were verified against the calculator above.
What competitors miss
Every other balance calculator in this space handles exactly one payment, which does not match how invoices are actually paid: deposits, progress payments, and final installments are the norm in contracting, freelancing, and tuition billing. The multiple-payments mode above was built for that reality, and it is the only one here with copy and share buttons for sending the running total to a client or bookkeeper.
Frequently asked questions
What is a balance due?
The portion of a bill, invoice, or loan that remains unpaid after subtracting all payments made so far.
What does it mean if the calculator shows "Overpaid"?
More was paid than the total owed. The figure shown is the excess, which is usually refunded or applied as a credit to the account.
Can I enter multiple payments?
Yes. Switch to the Multiple payments tab and list each payment on its own line; blank lines are ignored.
Is balance due the same as the unpaid balance on a credit card?
Not quite. Balance due is a simple subtraction. A credit card's unpaid balance also accrues periodic interest and adds new purchases, so it needs an interest-aware calculation.
How do businesses use a balance due calculator?
To track invoice aging, reconcile client accounts, confirm deposits against project totals, and give customers a clear remaining figure that prevents disputes.
What should I do if I overpaid?
Contact the biller: most will refund the excess or hold it as a credit toward your next bill. Keep the calculation as your record.